Counter resetting mechanism



Sept. 16, 1952 +1. N. BLISS COUNTER RESETTING MECHANISM 2 Si- EETSSHEET1 Original Filed Nov. 27, 1946 HARVEY N BLISS Sept. 16, 1952 H. N. BLISS2,610,794

COUNTER RESETTING MECHANISM Original Filed Nov. 27, 1946 2 SHEETS-SHEET2 A M Z) 33 a4" 35- g fig 5 76 j ea p lg? V.)

0 T Zf a /7 v Ji -3,11 mum: 9 6'2 r HARVEYNBLJJS 3 57 Patented Sept. 16,1952 COUNTER RESETTING MECHANISM Harvey N. Bliss, Windsor, Conn.,assignor to Veeder-Root Incorporated, Hartford, Conn, a corporation ofConnecticut Original application November 27, 1946, Serial No. 712,575,now Patent No. 2,524,755, dated tober 10, 1950. Divided and thisapplication December 27, 1948, Serial No. 67,473

8 Claims. (Cl 235-144) The present application is a division of mycopending application Serial No. 712,575, filed November 27, 1946, nowPatent No. 2,524,755, issued October 10, 1950.

The present invention relates generally to registering or countingapparatus, and more particularly to a number wheel for use in suchapparatus. The number wheel of the present invention is characterized inthat there is provided a friction drive between the indicia bearingportion or cup of the wheel and the positively driven components of thewheel.

The utility and advantage of such a frictionally driven wheel resides,in part, in the preferred manner in which it may be reset to zero. Thatis to say, the wheel (or at least the indicia bearing portion thereof)may be mounted for resetting to zero in a direction of rotation oppositeto that from which it is driven during operation of the registering orcounting apparatus. As will be readily apparent, thi manner of resettingapplies a force to the driving gear train in the same directicn asapplied during counting or registering thus eliminating any backlasheffect and a resulting inaccuracy in the count. A further advantage of abackward reset is that the operator cannot fraudulently advanceor-increase the count by use of the resetting mechanism. Anotheradvantage of a frictional drive is that it will avoid breakage such aswhen the operator intentionally or otherwise attempts to reset thecounter or register during a counting or registering operation.

An object of the present invention is to provide a frictionally drivenregister wheel for the purpose described in which the frictional forceapplied may be reduced but not entirely eliminated during resetting tofacilitate the resetting operation. This arrangement permits'a strongnon-slipping connection during registering or counting which may bereduced to make resetting easy and to eliminate strain during resetting,but at the same time a free rotating condition of the wheel is avoidedso that the wheel will not rotate except as intended by the resettingmechanism.

A further object of the invention is to provide such a shiftablefrictionally driven number wheel which is effective and foolproof inoperation, which is of simple and rugged construction such that it willprovide satisfactory service over long periods of use, which is compactin arrangement so as to be generally similar in appearance and size to aconventional register wheel, which is economical to fabricate andassemble, and which may be manufactured at relatively low cost.

Other objects will be in part obvious and in part pointed out more indetail hereinafter.

The invention accordingly consists in the features of construction,combination of elements and arrangement of parts which will beexemplifled in the construction hereafter set forth and the scope of theapplication of which will be indicated in the appended claims.

In the drawings- Figure 1 is a front view of a predeterminator registerincorporating the frictionally driven wheel construction of the presentinvention;

Fig. 2 is a cross sectional view taken along the line 22 of Fig. 1;

Fig. 3 is a cross sectional view taken along the line 3-3 of Fig. 1;

Fig. 4 is a top view of the register;

Fi 5 is a transverse cross sectional view of a non-indicating wheelutilized as the counterwheel unit of lowest order of the predeterminingcounter;

Fig. 6 is a cross sectional view of the same wheel taken at a rightangle to that of Fig. 5;

Fig. 7 is a cross sectional view of the counterwheel unit of lowestorder of the registering counter, which wheel is a frictionally drivenwheel constructed in accordance with and embodying the presentinvention; and

Fig. 8 is a cross sectional view taken along the line 8-8 of Fig. '7.

In order to demonstrate the use of the present invention and by way ofbackground, the indicator Wheel of the present invention will bedescribed in connection with the predeterminator register shown andclaimed in the parent application referred to above. However, this isdone merely by way of illustration and it is to be under stood that theinvention is not limited to this particular application of the wheel.

Referring to the drawings, and particularly Figs. 1 and 4, there isshown a predeterminator register mounted on a frame comprising a baseplate It. and side plates II and 2. The register is adapted to bedriven, for example, by a meter (not shown in the drawings) which isoperatively connected to the register through the gear train it!positioned in the rear of the device. The gear train culminates in abevel gear it fixed on a shaft 15 rotatably mounted on the side plates iand I2.

As best shown in Fig. 2, the shaft 15 has a spur gear l6 fixed at oneend thereto which is in mesh with a driven gear ll fixed to the firstcounterwheel unit l8 of the registering counter A, which unit I8 isconstructed in accordance with and ating or operating the shut-off of anassociated apparatus such as a fluid valveor 'pump (not shown). In theembodiment shown, the wheel unit 23 is not provided with'indicia and isnot ar ranged to be viewed. However, 'thi'sisa'mere matter of choice.

The counterwheel units (shown five) of the registering counter Ahereinafter. referred to as the "registering counterwheel units." areare ranged in progressive order, the first unit !8 being adapted toregister tenths, the secondtoregister units, etc. The fzrst registeringcounterwhee nit a n eia com r sin /10. to while. ndie e eempr sins heiur s H139? a e. rov d d; the usua manner 1 th per pheri the. ema niwheel unit to si t r. wit w ind ws n e a i (not shown) wh reby t e.- etina o the. w ee s ay be ebserved and read. Except forthe first unit It,each of these counterwheel unitsis of a conventional type and will notbe described in detail here. Each s pr vided wi h e euet' r v ns se anddr en. sear ada ted. e. eeser te with the tr nsietinien e m ented n a anini n haft)? ex nd n -be ween h i e plates ii and I2. Any suitabletransfer mechanism may e. t zed. n le. r iel lar ons selected forms nopart of the present invention.

The upper et eietnterwheel nite m mg. he. twee er-m ning. eeunter Bhereinafter efer ed te. as the. predeterm ni s c u e wh n t omprise an.equal n m ef w el n including the non-indicating wheel unit 23 pree l ered; ll Qi-t e P ede e n counterwheel units with the exception of the stn 2. e ee ides; inthe ual. manner with ndie e ran in r m Q." e- Alle h eetedetermini s ounterwhtel u s. rota hly e med n a h t 2ii. X. end ns-.btween t e side plates H and |2. In the completely assembled device,means (netshown in the drawings) "is provided for presetting eachofthewheel units separately for. any desired reading, except forthenon-indicating unit23 which is continue l eere l e he r t esist r ns c uterwheel unit. d W se..- ett ns. ther fore, fixe thereby. Suchpresetting meansis wellknown in the an, being usually comprised ofindividual presetting shafts and knobs. adapted to cooperate with thebevel-gears 2}} respectively fixed to each of the predeterminingcounterwheel units, Any suitablepresetting arrangementmay be utilizedand the particular mechanism selectedforms no partof the presentinvention.

Each of the predeterminingcounterwheel units. with the exception of'thenon-indicating wheel unit 23 whichis directly geared to the firstregis-,

tering counterwheel'unitv I8, as described above, is driven by. a camand ratchet arrangement and rotatable therewith causesa lever arm 3| tobereciprocated up and downfor each turn of the counterwheel unit.Thecamming disk 30 is so arranged that the leverarm 3! is drivenupwardlyduringv thefirst half ofaturnof thezwheel 33 which, in turn, ispivotally mounted on the.

shaft 28 supporting the predetermining counterwheel units of thepredetermining counter B. Accordingly} the frame also is reciprocated upand down by the turning of the counterwheel unit 58., I

K Pivotally supported on a shaft 34 extending through the pivotal framemember 33 are a plurality oi fratchet arms 35 which are adapted, re-

spectively, toengage ratchet wheels 36, one of which is fixed to. eachof the predetermining counterwheel units. Each of the ratchet wheels 35is' provided with notches 31 corresponding to the indicia on the numberwheel, which notches e. l o qua e, and. a re vely ee not a. p s t ne e na em nt wi h e r t het. a m a h h P ic r e nterwheei nt registers zero.The ratchet 35 are disposed;

at relative angles decreasing inseence. h t t en. eee f hem et i in nese ent i e e e le eunte rwheel unit of lower order, thetremainingratchet ms eeneet en a -the.ne h ;etbe-r e t higher order. Howeverg;when the counterwheel e l r whe s the eue whe unit of lower order hasbeen regresse d tot zerof the notch 33- of that wheel, which thenreceives the corresponding arm 35 issufiiciently deep to. permit thearmed foractuating thernext countere wheel unit to beJdisplacedinto;engagement with; a notch of the saidnext counterwheel unit,v thus heeehes 38 being formed o-i -sufficientgdepth so -that all; ratchet wheelsa re engaged by-the ratchet arms,- 35 when the notchestfl are aligneditwill be ap;. parent that during the reciprocatiou o f'th e framemember 33 the? turning of the predetermining; counterwheel units to zerowill be accomplished} in a stepwise fashion, i..e., thewheelunitsarezrewturnedand come to rest atv zeroiinsequence be-,. ginning with the wheelunit offhighest-order. As mentioned ab ove the driving ot the.predetermin -r ing: counterwhe el units is accomplished during thefi1'll-I l tlf Of eachturnof the first. registering; counterwheel unit.[El and remain" stationary dun ing-the lasthalf of the turn. In otherwords a full count is registered by said wheels during functioning as at1 nsfer device.

substantially one-half count of the counterwheel unit I8 and oftheadjustablewheel. 23:,

The lower of the lever arm s! Which rests n. 2 3 3%? 1 5: of? h e i t nf leeit iee i ieeee v: e eh positioning membentt secured to thebase-"pla'te; H I The sup-r. porting; member; it. has at its Qup pe enda gen}. erallv L-shaped slot 2 iorreceivingsthe fianged roller 3-2 onthe en W of the arm 3,5. t The Sup porting member tt and the fiang-edroller -'i2:-t ?eso arranged that the flanges on the roller tg by H] ofthe frarngbysuitable; screws- 4i;

e e e the hesides 5 3 1 69 9? ez r n any sidewise-pivoti he ede er nieuntet he nite; eprevie mrc fi hez rit chesi l u ner hat the te er l ilke i e emen w th. e am; sh ihe; rt -z i en 1 he he e e h rmitehe.ensi'etthe arm-: t 1 e r cateq ver i allr eause.- he;. ri n ;or;

positive engagement: between the cam disk 30 and the lever arm 31 duringdriving because the tendency of the lower endof the: arm 3| to move orpivot toward the front of the register (due to friction between the arm3! and .cam disk30) is. effectively controlled by the forward edge ofthe L-shaped slot 42. This tendency of the lever arm 3| to move or pivotforwardly of. the register is increased, moreover, by a spring43"situated between the arm 3i and the .frame member 33. When the camdisk. 3tv is turned in a. reverse or clockwise direction, which occurswhen the reels tering counterwheel 'unitsare being reset to. zero, thelower end of the lever arm, which will now tend to move or pivotinwardly of the register, rides outwardly in the :;L-shap.ed' :slot 42'and, therefore, will not be :reciprocatednp :anddown. In this way,nomotion'i's: transmitted .toithe frame member a33tduring resetting .ofthe registering counterwheel'nnits and,.consequently,:there .is noresultant turningr'ofithese'units and-no effect upon the reading shownthereon.

As referred to above, the first registering'counterwheelunit 18isrotated .bya driven gear ll fixed thereto and it, in turn, drives thefirst predetermining counterwheel unit 23, (the nonindicating wheel) bya smaller or'secondgear 2U fixed.- thereto. The construction of thefirst registering counterwheel: unit i8, which-is constructed inaccordance with the present invention, is bestshown in Figs. 7 and "8.Referring toFig. 7, it will be observed that the counterwheel unit l8comprises a number-wheel 50 having a hub 5| with a, relativelysma-ll'centralopening 52 at one-end to accommodate. the main portion of.the resetting. shaft 53 on which the registering counterwheel; units arerotatably mounted, and an enlargedopeni-ng 54 at the other'end toslidably accommodate a boss 55* on the resetting shaft 53. Fixed to thehub '51. ofv the numberwheel is the cam disk 30. referred to above, alocking disk 56, and a third disk 51 said disk 51 and locking disk 56being ,spacedapart by spacing pins 58 therebetween. A transfer pin (notshown)- may be provided on the disk '51 to engage the first transferpinion 25 to cause it to-turnwand thus advance the second registeringwheel unitone number for eachturn of the unitwheel 1B.- The resettingshaft 53 contains an annular groove 59 for receiving apawlfiflg-pivotally mounted in the hub 51 of the number wheel 50 andurged towa-rdthe shaft by a spring member Bl as best shown inFig. 8.When .the resetting shaft 53 is pushed inwardly from right to left asviewed in Fig.7, the-pawlfiil rides-laterally out of the annular groove59and is-held on the outer periphery of theshaft 53 unless or. untilsuch time as the shaft is rotated to align the longitudinal resettinggroove 62therewithywhereupon the pawl 60 pivots into engagement with thegroove 62 and the. number wheel Sill-becomes, in effect; keyed to theresetting shaft 5 3 andmay be reset thereby to zero.- a v The *drivengear I7- is rotatably "positioned on the hub 55 atthe end having theenlarged opening '54 and a connection is made between this gear and the;number wheel 50 by means of a pressure plate 63 whichis -slidably keyedto the hub'5i' so that it"rotates therewith but is longitudinallyslidably thereon. The plate 63 is urged laterally into contact'with thedriven ,gear ll-by; a-relativel-y strong spiral spring -64 extendingbetween the plate 63. and a shoulder 65' on the hub 5l of thenui-nberwheel 50.= When the resetting shaft 53 ispushed inwardly fromright to left as viewed in Fig. 7', .aswhen .iwisintended to reset thenumber wheel. units, the boss 55- on the shaft 53 engages the pressureplate 63 and moves it laterally inwardly against the pressure of thespiral spring 64, thereby disengaging the number wheel 5!] from thedriven gear ll so that the number wheel is free to. be reset to zero byturning the reset shaft 53'.

Although the resetting shaft 53 is. not intended to rotate the numberwheel 5!] :until the pawl 59 is engaged in the longitudinal:resetting.groove 62, it has been found that-therefreauently'is sufficient frictionbetween hub 5i and/or the pawl 69 and the peripheryof'theresetting'shaft 53' to cause the number wheel: 50 -.to be rotatedbefore the pawl 65 becomes aligned and engaged with the resetting groove.62. This tendencyiof the number wheel to rotate prematurely has beenavoided in accordance with the invention by pro viding a second pressureplate 66 slidably keyed to the hub 5! so that it. is rotatabletherewithbut slidable longitudinally thereon, which. plate is adapted tofrictionally engage the driven gear ii on the face opposite to that.engaged by. the first pressure plate 63. shown, the pressure plate 65 isbetween the driven gear I1 and the smaller driving gear 720 which isalso slidable longitudinally on the hub El ofithe numbering wheel, thispair of elements (plate 66 and gear 253) being urged toward the drivengear I! by a coil spring 61 supported on a flanged collar 68 retained onthe hub 51 of the wheel by the retaining ring 29 received in an annulargroove 10 in the hub. The frictional engagement of the pressure plates53 and .86 and the driven gear H is facilitated by a pair offrictiondisks ll therebetween. The pressure exerted by the spring 6'! isrelatively weak being justsufficient to overcome the friction referredto above without materially interfering with the. resetting operation.

The predeterminator shown-in the drawings is adapted to shut off oractuate a shut-off mechanism for an associated apparatus (not shown)through a reciprocal connecting .arm 12. The

arm 12 is pivotally connected to a pivoted leverv arm 13 which isattached at one end to a roller bar 14 comprising a series of rollers 15adapted to respectively engage cam disks l6 onthe pre determiningcounterwheel units of the predetermining counter B. The pivoted leverarm 13 is.

biased by a spring 1'! so as to force the rollers l5 upwardly againstthe peripheries of the cam disks 16. Each of these cam disks "I6 isprovided with a notch 18 for receiving the rollers '15 when thecounterwheel units are returned to zero during a dispensing operation.As will be apparent, when all of the notches 18 are in alignment withthe rollers 15, the lever arm 13 is permitted to pivot under theinfluence of the biasing spring Tl thereby lowering the connecting arm12 which is utilized to shut off the associated apparatus by anysuitable connection thereto (not shown). Inasmuch as there is usually abrief time interval (due to inertia, for example) between the instantthe notches become aligned and the associated apparatus becomes fullystopped, it has been found necessary to provide a notch 18 in the firstpredetermining counterwheel unit, 1. e., the non-indicating wheel unit23, which is somewhat in advance of the zero position, whereby theshutting off of the associated apparatus is initiated slightly beforethe desired quantity has been dispensed and whereby the actual shuttingoff of the associated apparatus is completed-by In the specificembodiment the time'the wheelunit 23 reaches zero position. As theamount of coasting after the shutting off of the associated apparatushas been initiated, but beforeit is completed, will vary widely indifferent installations, depending on the type of associated apparatus,the shutting off means utilized, etc., it has been found impossible toselect a fixed position of the notch 18 of the wheel unit 23 which inall installations will effectively cause the associated apparatus tobecome completely shut off at the exact instant when the desiredpredetermined number of units has been dispensed or counted.

Accordingly, the counterwheel unit 23 has been constructed so that theposition of the notch 18 is variable with respect to the position of thedriven elements of the wheel whereby the same may be adjusted to fit anyparticular installation. The construction of the counterwheel unit isshown more particularly in Figs. and 6. Referring to these figures, itwill be seen that the counterwheel unit 23 is formed in two separatesections C and D. Section C thereof, which includes the cam surface 16and a notch 18 therein for causing actuation of the roller bar, aspreviously described, is provided with a hub 89 which extends into arecess 8| formed in the second section D of the wheel unit. Section D ofthe wheel unit, which carried the driven gear 22 previously referred to,is formed with a slot 83 tangential to the periphery of the hub 80 inwhich is positioned a worm 84 for engaging teeth 82 formed on the hub80. The worm 84 is positioned in the slot 83 by engagement of shoulder'35 in the slot with an annular groove 86 in the Worm. A spring 81 isprovided in theirecess 88 to exert a longitudinal force upon the worm B4to effectively overcome any tendency of the worm to turn because ofvibration or the like. The end of the worm is formed with a slot 39 forreceiving a suitable tool (not shown), such as a screw driver, by meansof which the worm can be manually turned. Turning of the worm 84, byreason of its engagement with the toothed hub 88 ofsection C of thewheel, provides an infinite adjustment between the sections C and D ofthe wheel unit whereby the notch 18 in the first section 0 may bepositioned at any desired rotated point with respect to the drivingmechanism carried by section D of the counterwheel unit. If desired,suitable indicia (not shown) may be provided on the peripheries of thesections C and D adjacent the inner edges to facilitate the relativepositioning of the sections by the operator.

Inasmuch as the visible predetermining counterwheel units are completelyactuated during the first half turn of the registering counterwheel unitof lowest order 18 as previously described, it will be appreciated thatthe relative settings of the sections C and D of the counterwheel unit23 at least during the last half of a turn thereof will have no effectwhatsoever on the driving and positioning of the visible predeterminingcounterwheel units. This is a material advantage giving a high degree offlexibility to the adjustment of the counterwheel unit 23.

The device constructed in accordance with the inventiomas describedabove. will be seen to have many novel and useful advantages resultingin superior performance of the device and greatly increasing itsusefulness. The simplicity and ease of manufacturing of the parts hasbeen improved while, at the same time, the device is less susceptible tobreakage or malfunctioning through improper usage of the device eitherin= advertently orv purposely.

As many changes could be made in the above construction and manyapparently widely different embodiments of this invention could be madewithout departing from the scope thereof, it is intended that all mattercontained in the above description or shown in the accompanying drawingsshall be interpreted as illustrative and not in a limiting sense.

The counterwheel unit 23 described above and shown in Figs. 5 and 6 ofthe drawings is disclosed and claimed in the copending application ofJames B. Hoye, Serial No. 67,451, filed December 27, 1948.

I claim as my invention:

1. In a register mechanism, the combination comprising a longitudinallyshiftable reset shaft, a counterwheel unit rotatably mounted on theshaft, means operative when the reset shaft is shifted longitudinallyfor forming a driving connection between the reset shaft andcounterwheel unit, a driven member rotatably mounted on the shaft,friction means interconnecting the counterwheel unit and the drivenmember, a pair of springs for applying pressure to said friction means,and means actuated by the reset shaft for relieving the pressure of oneof said springs when the reset shaft is. shifted to carry out aresetting operation.

2. In a register mechanism, the combination comprising a longitudinallyshiftable reset shaft, a counterwheel unit rotatably mounted on theshaft, means operative when the reset shaft is shifted longitudinallyfor forming a driving connection between the reset shaft andcounterwheel unit, a driven member rotatably mounted on the shaft,friction means interconnecting the counterwheel unit and the drivenmember, comprising a pair of elements axially slidable but non-rotatablyfixed to the conuterwheel and disposed on opposite sides of the drivenmeans, a pair of springs urging said elements toward the driven member,and means actuated by the reset shaft for displacing one of the elementsaway from the driven member when the reset shaft is shiftedlongitudinally.

3. In a'register mechanism, the combination comprising a longitudinallyshiftable reset shaft, a counterwheel unit rotatably mounted on theshaft, means operative when the reset shaft is shifted longitudinallyfor forming a driving connection between the reset shaft andcounterwheel unit, a driven gear rotatably mounted on the shaft, meansnormally interengaging the counterwheel unit and the drive gear butreleasable by longitudinally shifting of the reset shaft, and brakingmeans operable between the driven gear and the counterwheel unit forretarding rotation of the counterwheel unit relative to the driven gearwhen said interengaging means is released.

4. In a register mechanism, the combination comprising a longitudinallyshiftable reset shaft, a counterwheel unit rotatably mounted on theshaft, means operative when the reset shaft is shifted longitudinallyfor forming a driving connection between the reset shaft andcounterwheel unit, a driven gear rotatably mounted on the shaft, apressure plate slidably secured to the counterwheel unit and adapted toform a frictional engagement with the driven gear, a spring for urgingsaid pressure plate into frictional engagement with said driven gearwith sufficient force to cause said wheel unit to be driven by saidgear, means on the reset shaft for moving 9 said friction plate out offrictional engagement with said gear when the reset shaft is shiftedlongitudinally, a second friction plate slidably secured to thecounterwheel unit and adapted to frictionally engage said driven gear,and a spring for urging said pressure plate into yielding frictionalengagement with said gear.

5. In a register mechanism, the combination comprising a longitudinallyshiftable reset shaft having a longitudinal reset groove therein, acounterwheel unit having a hub rotatably mounted on said shaft, a resetpawl mounted in said hub and adapted to engage the reset groove when thereset shaft is shifted longitudinally and turned to align the resetgroove therewith, a

driven gear rotatably mounted on the hub, a pressure plate slidablykeyed to the hub, a spring for urging the pressure plate into frictionalengagement with one side of the driven gear, a

shoulder on the reset shaft for sliding the pressure plate out ofengagement with said driven gear when the reset shaft is shiftedlongitudinally, a second pressure plate slidably keyed to the hub, and aspring for urging the second pressure plate into frictional engagementwith the other side of the driven gear, the force of said last namedspring being sufficient to prevent turning of the counterwheel unit withthe reset shaft prior to engagement of the reset pawl in the resetgroove but insufficient to prevent resetting.

6. In a register mechanism, the combination comprising a longitudinallyshiftable reset shaft; a counterwheel assembly comprising a hubrotatably mounted on the shaft, a number wheel fixed to the hub forrotation therewith, a driven gear mounted on the hub and freelyrotatable thereon, a member slidably but non-rotatably mounted on thehub and engageable with the driven gear, and means biasing the memberinto frictional engagement with the driven gear; and means forming aconnection between the member and reset shaft whereby the member may beshifted to reduce the friction between the member and the driven gearwhen the reset shaft is shifted 7. In a register mechanism, thecombination comprising a longitudinally shiftable reset shaft having aradial shoulder and a counterwheel assembly comprising a hub rotatablymounted on the shaft, a number wheel fixed to the hub for rotationtherewith, a driven gear mounted on the hub and freely rotatablethereon, a friction member non-rotatably mounted on the hub but slidableinto and out of frictional engagement with the driven gear, meansbiasing the member into engagement with the driven gear, and aprojection on the friction member extending into the hub for engagementwith the shoulder of the reset shaft, whereby the friction member may beshifted by the reset shaft.

8. In a register mechanism, the combination comprising a longitudinallyshiftable reset shaft having a radial shoulder, and a counterwheelassembly comprising a hub rotatably mounted on the shaft having anenlarged portion slidably receiving said shoulder, a driven gear freelyrotatable on the hub, a cup-shaped number wheel fixed to the hub withits open side facing the driven gear, a friction member non-rotatablybut slidably mounted on the hub within the cupshaped number wheel, meansbiasing the friction member toward the gear, and an extension on thefriction member extending into said enlarged portion of the hub forengagement by the shoulder of the reset shaft.

HARVEY N. BLISS.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNETED STATES PATENTS Number Name Date 306,629 Maertens Oct. 14, 18841,433,299 Prouty Oct. 24, 1922 1,671,553 Sheldrick May 29, 19281,980,232 Slye Nov. 13, 1934 2,177,437 McLaren Oct. 24, 1939 2,203,109Slye June 4, 1940 2,342,325 Bliss Feb. 22, 1944 2,390,239 De Lancey Dec.4, 1945

